軟鋼の切欠脆性に及ぼす撓み速度の影響 : 鋼材の切欠感度識別に関する簡易試験法について(第 4 報)

概要

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In order to specify the notch toughness of steels the authors recently proposed the adoption of the criterion : Ф=(maximum load)/(maximum load-point deflection) at room temperature on the notched slow bending test. In this report the behaviors of Ф under three kinds of deflection rates were investigated, using the V-type standard charpy specimens, in connection with the notch toughness of materials. As the results of this experiment, the behaviors of Ф were found as follows : (a) Ф value remains constant within certain temperature range into which room temperature is included. (b) The larger deflection rate causes the transition temperature and Ф value of material to be higher. And thus the larger Ф value is connected with the higher transition temperature. Consequently the presumption of the notch toughness of materials by Ф yalue in the notched slow bending test could be substantiated in the case of various deflection rates.
社団法人溶接学会の論文
1954-10-01